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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the ADSH800403AXAA furnace. This transition piece channels combustion products from the furnace's induced-draft outlet into the vent connector, maintaining the correct flue geometry for safe and efficient draft. A properly fitted transition prevents flue-gas leakage and supports reliable pressure-switch operation.
This factory OEM transition is dimensioned to match the furnace cabinet and vent collar exactly. Generic or fabricated substitutes risk gaps and misalignment that compromise the venting seal and combustion safety. For any flue component, OEM fit is the safe choice.
Moderate (3/5). Requires removing the existing transition, sealing the new piece, and verifying the vent connection. Shut off power and gas first; confirm a tight, leak-free joint and proper draft after installation.